To estimate construction costs, define the scope, measure quantities, price labor at your true labor rate, price materials with waste, get subcontractor quotes and add job costs like permits and disposal. Then add overhead, profit and a contingency sized to the risk. Before it goes to the client, check the total against your past jobs and published benchmarks.
Here are the steps in order:
Every estimate has the same layers, whether it’s a small bathroom repair or a new house:
A missing layer does more damage than a math error. A careful material list doesn’t help if overhead never made it into the price.
Write down exactly what you’re pricing before you price anything. Walk the site, take photos and measurements, and ask the questions that change cost: what stays, what goes, what the client is supplying and which finishes they have in mind. List exclusions plainly, and use allowances for items the client hasn’t picked yet, like tile or light fixtures.
A vague scope is where bad estimates and change order fights both start. If you can’t describe a line item clearly, you can’t price it.
A takeoff turns the scope into quantities: square feet of drywall and tile, linear feet of trim and cabinets, and counts of fixtures, outlets and doors. Measure from plans or in the field, and group quantities by trade or phase so they line up with how the work gets built and billed.
Keep raw quantities separate from waste. Apply waste as its own factor when you price materials, so you can see it and adjust it by material.
Labor cost is hours times a fully loaded hourly rate. Estimate hours from your own past jobs where you can, task by task: how long it really takes your crew to frame a wall, set a vanity or tile a shower floor.
The rate has to cover more than wages. Payroll taxes, workers’ compensation, insurance, paid time off and other benefits all ride on top. The Bureau of Labor Statistics reports that in June 2026, private employers in construction spent an average of $36.13 per hour worked on wages and salaries and $15.84 on benefits, for $51.96 in total compensation. That’s about 44 cents in benefits for every dollar of wages, before you count unbillable hours like drive time and shop time. Your numbers will differ, so work out your own with the labor rate calculator.
Price materials from current supplier quotes, not last year’s invoices. Add waste by material, plus delivery and sales tax where they apply. Date every quote, and put a valid-until date on your estimate, because material prices move.
Send every sub the same scope sheet so their quotes compare like for like. Check what each quote leaves out, such as permits, patching or cleanup, and price those gaps yourself. Mark up sub costs like any other cost; managing subs takes your time and carries your risk.
Permits, dumpsters, equipment rental, portable toilets, protection and final cleaning are easy to forget and easy to price. Keep a checklist and run through it on every estimate. The free estimate template gives you a clean format for line items, exclusions and allowances, with an Excel version that does the math.
Once you know your job cost, you need a price that covers overhead and leaves a profit. This is where markup and margin get mixed up.
Start from the gross margin you need: your overhead as a share of revenue, plus your profit target. Then price the job with this formula: price = cost ÷ (1 − target margin).
Say a job costs $40,000 and you need a 30% gross margin. The price is $40,000 ÷ 0.70 = $57,143. That’s a markup of about 42.9% on cost. If you added 30% to cost instead, you’d price the job at $52,000 and earn a margin of about 23.1%, well short of what you need.
Our post on markup vs. margin walks through why this happens, and the markup calculator does the conversion for you.
For a sense of scale on new homes, the National Association of Home Builders’ 2024 cost survey found that overhead and general expenses averaged 5.7% of a new home’s sales price and builder profit averaged 11.0%. Remodelers and trade contractors run different cost structures, so set your targets from your own books.
Contingency covers risks you know exist but can’t price exactly: what’s behind the wall, how long an inspection takes, a design that isn’t finished. Size it to the risk, not to habit.
One public reference point is P120, the U.S. General Services Administration’s cost and schedule policy for federal buildings. Its design contingency guidelines shrink as the design gets more complete. For repair and alteration projects, they run from 10% to 15% of direct cost at concept design, 7.5% to 10% at design development and 1.5% to 3.5% at 90% construction documents, down to 0% when the documents are final. For new construction, the ranges are the same or lower.
A kitchen remodel isn’t a federal building, but the lesson carries over: the less you know, the more contingency you need. A few practical ways to handle it:
Whether you show contingency as its own line or build it into prices, decide on purpose and do it the same way every time.
Before an estimate goes out, step back from the line items and look at the whole.
After the job, compare what you estimated with what you spent, line by line. That feedback is what makes the next estimate better.
Build the estimate from the bottom up: a clear scope, measured quantities, labor hours at your fully loaded rate, current material prices with waste, sub quotes and job costs. Then add overhead, profit and contingency, and check the total against your past jobs.
Enough to reach the gross margin your business needs: your overhead as a share of revenue plus your profit target. Convert that margin to a price with price = cost ÷ (1 − margin). There’s no single right percentage, because overhead differs from company to company.
It depends on how much is still unknown. GSA’s guidelines for federal repair and alteration projects run from 10% to 15% at concept design down to 0% when construction documents are final. Size yours to the risk on each job.
People use the words loosely. An estimate is often your best projection of the price, while a bid or quote is often a firm price for a defined scope. What counts is the wording in your signed contract.
Cost per square foot is useful for a quick ballpark and for checking a finished estimate against past jobs. It’s too rough to price a job on its own, because scope, finishes and site conditions vary so much.
O&P stands for overhead and profit. Overhead is what the business spends that isn’t tied to one job, like your office, trucks, insurance and software. Profit is what the business keeps after everything is paid. Add them as a gross margin, not a markup: price = cost ÷ (1 − target margin). Divide a $40,000 cost by 0.70 and the price is $57,143, a markup of about 42.9%. The markup calculator does the conversion.
Use the same layers as any estimate: scope, takeoff, labor, materials, subs, job costs, overhead, profit and contingency. Then check the cost mix. NAHB’s 2024 survey found interior finishes averaged 24.1% of construction costs, major system rough-ins 19.2% and framing 16.6%, with overhead at 5.7% and builder profit at 11.0% of the sales price. See how ECHOPS works for home builders.
Multiply estimated hours by a fully loaded hourly rate, not the wage. BLS data for June 2026 shows private construction employers spent an average of $36.13 per hour worked on wages and $15.84 on benefits, about 44 cents in benefits per dollar of wages, before unbillable time like drive and shop hours. Work out your own rate in how to calculate labor cost.
ECHOPS builds estimates from your price book, where each item is priced by size, unit or allowance with its own cost parts, markup and waste, so every estimate prices the same way. You can search Home Depot or Google Shopping and add items at cost with your markup, offer options and payment plans in one quote, and send a quote link that shows when the client opens it and lets them sign online. You can also draw room layouts to scale and measure plans for takeoffs that go straight into the quote. After the job, the profit per job report shows what each job charged, what it cost in materials and labor, and the margin.
Posts are general information, not legal, tax or financial advice.
Keep reading
Pricing, sales, operations and the legal side of contracting.
Read the blog →Starting a remodeling business, selling kitchen and bath jobs, and choosing software.
Read the guides →Estimates, contracts, change orders, invoices and more, as PDF plus Word or Excel.
Get the templates →Try ECHOPS free for 14 days with your own leads and jobs. No credit card, and your workspace is ready in minutes.
Special price: your first 2 months from $49/mo. Limited spots, so sign up today.